I know that this is a ridiculous question, but you can blame my inability to command computers for it. How do you upload custom textures/brushes to Adobe Photoshop CS2 (Mac)?
Good question. I'm not sure about this, Todd or Keaton [iThink?] might be able to help you better, but you should be able to store them anywhere [a folder local to PS preferably, I'd say] and then import them to PS using the open option, or probably drag and dropping will work too [has for me].
Adding brushes is pretty easy, but you got to find out how to do it. I'd suggest this tutorial: http://www.photoshop.brushes.btinternet.co.uk/addbrushes.shtml I don't know about the textures, though.
I would assume the textures are similar to patterns, so look around near the textures options/panel/whatever. I honestly doubt it's something complicated. Oo